WhisperComfort® 60 has two filters that clean the exhaust and supply air before passing through the ERV core, extending the life of the core. A replaceable Merv 13 filters incoming air, while a reusable return air dust filter protects the core from outgoing stale air. A convenient indicator light will help inform the homeowner when it’s time to check and clean the filters. Both filters should be vacuumed with a soft brush attachment every 2-3 months or as needed, and the supply air filter should be inspected every 90 days and replaced every 6 months to maintain the ERV’s peak performance.